Microphone, What should i do if my microphone does not work, How can i prevent microphone feedback – Sony VPCSE23FX User Manual

VPCSE25FX, VPCSA4SGX, VPCSE2LFX, VPCSA4GFX, VPCSE2EFX, VPCSB490X, VPCSB4AFX, VPCSE2NFX, VPCSC41FM, VPCSA4MFY, VPCSE2SFX, VPCSA4FGX, VPCSA4EGX, VPCSA45GX, VPCSB4CFX, VPCSA4HGX, VPCSE2DGX, VPCSE290X, VPCSC4AFM, VPCSE2AGX, VPCSA4BGX, VPCSE2RFX, VPCSE2KGX, VPCSA4CFX, VPCSA41FX, VPCSA490X, VPCSA43FX, VPCSE2MFY, VPCSE2JFX, VPCSE27FX, VPCSE2HFX, VPCSB4DFX, VPCSA4JFX, VPCSA4DFX, VPCSA4AGX